The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.

Background:

Hobicha Caldera, north of Lake Abaya, is a large caldera of Pleistocene age. Fissures cutting the SE margin of the caldera produced numerous pyroclastic cones of Pleistocene-to-Holocene age (WoldeGabriel 1987, pers. comm.). This area of young basaltic volcanism is also referred to as the Northern Lake Abaya volcanic field.---Smithsonian / GVP volcano information

More on VolcanoDiscovery:

Igneous or magmatic rocks: The most primitive rock type forms when magma (molten rock) solidifies - either inside the earth (plutonic rocks) or during volcanic eruptions (volcanic rocks). A short overview.

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